665126222772 has 72 divisors (see below), whose sum is σ = 1714447672000. Its totient is φ = 200540482560.

The previous prime is 665126222771. The next prime is 665126222791. The reversal of 665126222772 is 277222621566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665126222771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 861997 + ... + 1439892.

Almost surely, 2^665126222772 is an apocalyptic number.

It is an amenable number.

665126222772 is an abundant number, since it is smaller than the sum of its proper divisors (1049321449228).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665126222772 is a wasteful number, since it uses less digits than its factorization.

665126222772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2302117 (or 2302104 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 48.

The spelling of 665126222772 in words is "six hundred sixty-five billion, one hundred twenty-six million, two hundred twenty-two thousand, seven hundred seventy-two".